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參數資料
| 型號： | TMDS442PNPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | PLASTIC, TQFP-128 |
| 文件頁數： | 22/45頁 |
| 文件大小： | 1977K |
| 代理商： | TMDS442PNPRG4 |
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Example - Reading From the TMDS442
TMDS Read Phase 1:
SLLS757A – AUGUST 2006 – REVISED MARCH 2007
STEP 1
0
I2C Start (Master)
S
STEP 2
7
6
5
4
3
2
1
0
I2C General Address (Master)
0
1
0
1
X
0
Where each X logic state is defined by I2C-A1 and I2C-A0 pins being tied to either Vs+ or GND.
STEP 3
9
I2C Acknowledge (Slave)
A
STEP 4
7
6
5
4
3
2
1
0
I2C Write Sink Port Address (Master)
0
Addr
Where Addr is determined by the values shown in Table 2.
STEP 5
9
I2C Acknowledge (Slave)
A
STEP 6
7
6
5
4
3
2
1
0
I2C Write Data (Master)
Data
Where Data is determined by the values shown in Table 3.
STEP 7
9
I2C Acknowledge (Slave)
A
STEP 8
0
I2C Stop (Master)
P
For step 4, an example of the proper bit control for selecting sink port 2 is 0000 0010.
For step 6, an example of the proper bit control for selecting source port B, enabling TMDS outputs and DDC link
of the sink port 2 without 3.5dB de-emphasis is 0000 1001.
The read operation consists of two phases. The first phase is the address phase. In this phase, an I2C master
initiates a write operation to the TMDS442 by generating a start condition (S) followed by the TMDS442 I2C
address, in MSB first bit order, followed by a 0 to indicate a write cycle. After receiving acknowledges from the
TMDS442, the master presents the sub-address (sink port) of the register it wants to read. After the cycle is
acknowledged (A), the master terminates the cycle immediately by generating a stop condition (P).
The second phase is the data phase. In this phase, an I2C master initiates a read operation to the TMDS442 by
generating a start condition followed by the TMDS442 I2C address (as shown below for a read operation), in
MSB first bit order, followed by a 1 to indicate a read cycle. After an acknowledge from the TMDS442, the I2C
master receives one byte of data from the TMDS442. After the data byte has been transferred from the
TMDS442 to the master, the master generates a NOT-acknowledge followed by a stop. Similar to the write
function, to read both sink ports steps 1 through 11 must be repeated for each and every sink port desired.
STEP 1
0
I2C Start (Master)
S
STEP 2
7
6
5
4
3
2
1
0
I2C General Address (Master)
0
1
0
1
X
0
Copyright 2006–2007, Texas Instruments Incorporated
29
Product Folder Link(s): TMDS442
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